To illustrate the relative energies of colors of visible light, we "do the wave" in my classroom, just like at the baseball park. We all stand up and students on one side are "red", doing the wave very slowly. The next row of students are "orange" and do the wave a little faster, and on until the last row are "violet" and waving fast and furiously! It's fun, expands a little teenager energy and students often remember this activity during a quiz or test.